Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c3bab65453116a…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 20:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4525c0c51c271831abf531400a5a32e SHA-1: 55601ad45540c0350b4762dbaf9681e6ba4a5c97 SHA-256: f2c3bab65453116a548949323582d37c9840672ecd92fd9a914340fe7fcb2aa8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external, potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://renhedc.com/uploads/files/202109120702303004.pdf In PDF document text
    • http://ateliergermain.net/sites/default/files/file/89080925891.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/84586908609.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/42793122120.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/76219615239.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/jeros.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109100803439860.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/fojakik.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613904739a78e---6558611681.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c27702f704---warofutefujozibi.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/ferizawupuxaz.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe8a2af5c---83796808832.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613525709e1e7---97928985218.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/matejutajodu.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/20717324219.pdfIn PDF document text
    • http://www.siposferenc.hu/html/losedowi.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/fejor.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/80336275319.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/35702670690.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/93800114896.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/xarutifixomun.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/finagewilifoganaxa.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/zubiberinaboxuf.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/68759792581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ppsspp+dragon+ballsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 10384 bytes
SHA-256: 0851efa5915cb467cf35e96ea6dcd1fd86d2d2f26874e4ccc6ec446adcb32d2a
font_01_sfnt_off000102af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AF 18016 bytes
SHA-256: 732a715e037abcf531535ac9c3e24ceeee44cf6d3309ed6cfa564b5d489865db
font_02_sfnt_off00013127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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